Spindle-locking mechanism.



L. mm..

SPINDLE LOGKING MEGHANISM.

APPLIATION FILED JUNE 3, 190%, I 914,527, Patent-ea Mar.9,1909.

, 2 SHEETS-SHEET 1.

L. THIEL.

SPINDLE LOOKING MEUHANISM.

APPLIoATIoN FILED JUNE s, 1907.

Patented Mar. 9, 1909.

2 SHEETS-SHEET 2.

LOUIS THIEL, OF CINCINNATI, OHIO.

SPINDLE-LOCKING MEGHANISIVI.

Specification of Letters Patent.

Patented March 9, 1909.

Application led June 3, 1907. Serial No. 377,072.

To all whom tt may concern:

Be it known that I, Louis THIEL, a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in S indle-IiockingMechanism, of which the fo lowing is a specification.

My invention relates to a spindle locking mechanism.

One of the objects of my invention is to provide means whereby thespindle of a machine can be locked against rotation when the powerdriving mechanism is at rest for applying and withdrawing various toolsto and from the spindle.

Another object of my invention is to provide means whereby the lock isautomatically thrown out when the machine is started, and at the sametime prevents a locking of the spindle while the machine is in rotation.

The features of the invention are more fully set forth in thedescription of the accompanying drawings, forming a part of thisspecification, in which Figure 1 is a side elevation, partly in section,of a portion of a milling machine with my improvement applied. Fig. 2 isan enlarged section on line Fig. 1. Fig. 3 is an enlarged section online c, c, Fig. 1. Fig. 4 is a perspective view of the lock pin. Fig. 5is a perspective view of the lock actuating pin.

1 represents the frame of the machine.

2 represents the main driving pulley. 8 represents the driven shafttherefor. 4 represents friction clutch mechanism for controlling therotation of said shaft 3.

5 represents a rod passing through the shaft 3 and secured at one end tothe clutch mechanism of the driving pulley 2, the opposite end isconnected by lever mechanism with the stud shaft 6. 7 represents a leverconnected to said shaft 6 for actuating the rod 5 for engaging andreleasing the friction clutch mechanism.

8 represents the spindle of the machine which it is desired to lockagainst rotation or movement when the same is at rest.

9 represents a cone of gears upon shaft 10k forming intermediatetransmission mechanism for transmitting motion from shaft 3 to thespindle 8.

11 represents a sleeve containing transmission gearing in step formslidably keyed upon the spindle 8.

12 represents a gear loosely mounted, in this instance, upon the spindleand provided with clutch teeth la, see dotted lines Fig. 1, adapted toengage into clutch teeth formed upon the sleeve 11. Thus it will be seenthat when the sleeve 11 is clutched with the gear 12 and said gear 12 islocked, that the spindle 8 is likewise locked. Of course, variousarrangements of speed changing transmission gears may be employedbetween the driving element and s indle, and I therefore do not wish toembody the transmission between the spindle and driving pulley, asshown, as a feature of my invention, the same being employed to showmeans whereby the lever controlling the drive of the machine is placedin juxtaposition, so that it will be impossible to lock the spindleduring its rotation by power.

12a represents a series of lugs formed on one side face of the gear 12against which the locking pin engages.

Again, as shown in the drawings, the locking mechanism is brought intoengagement with one of the transmitting gears on the spindle, but it isobvious that the spindle may be locked by independent means direct withthe spindle to accomplish the same end.

15 represents a lock pin slidably mounted in a bore formed in the frameof the machine, provided with the notch 16, into which the actuating pin17 passes for moving the lock pin 15 toits released position, shown inIii 2.

18 represents a coiled spring, one en of which bears against the lockpin 15, the opposite end against the nut 19.

20 represents a set screw threaded into the frame 1 and projecting intoa slot formed in the lock pin 15 to prevent the same from turning, atthe same time allowing free sliding action thereof.

The actuating pin 17 at its forward end is cut away, so as to seatwithin the notch 16, and its end thereof beveled, which beveled edge inthe forward movement of the actuating in 17 strikes against the shoulder22 formed by the notch 16 of the lock pin 15, thereby causing said lockpin to be moved, and in this instance, to its releasing position.

When the actuating pin 17 is moved outward, the locking pin 15 isautomatically brought to its locking position in the path ofv the lugs12a of gear 12, through the tension of the spring 18.

23 represents a set screw, adapted to engage within a groove formed inthe actuating pin to prevent the same from turning and forming a stop tolimit the outward ment of the actuating pin 17.

24 represents a spring controlled detent seated within the actuating pin17, preventlever 7, adapted to engage the actuating pin 17 when thelever is thrown to its position for starting the driving mechanism,thereby throwing the actuating pin 17 inward automatically and releasingthe locking pin 15. Thus it will be seen that it will be impossible tomaintain the spindle locked against rotation when the power is thrownon, andthe limit of lever movement controlling the drive is such that itwill be impossibleto withdraw the actuating pin 17 in this position oflever. It is necessary to move the lever to the power cut-oif positionbefore the spindle can be locked.

1n a machine of this class where the working tools, face plates, chucks,etc., are applied directly upon the spindle it is desired to apply themin position very rigidly. Therefore it is essential to hold the spindleagainst movement, and also to relieve such strains as are thus impartedupon the spindle in applying and withdrawing the work too s therefromfrom the gearing controlling the drive of the spindle. This isaccomplished by my improved structure, thereby saving the breakage ofteeth of the transmission gearing or otherwise injuring the machine, atthe same time affording a lock against which great pressure can beapplied in changing the working tools u on the spindle.

Having descrl ed my invention, 1 claim 1. spindle, a lock pin therefor,a pin manipulator, and a lever for controlling the spindle drive, thelever being adapted to block the movement of the manipulator when thepower is in and to automatically operate the manipulator in throwing inthe power, substantially as described.

2. In a machine of the class described, a main frame, a spindle journaled in said frame, a main drive, a lever for controlling saiddrive, a lock pin for locking the spindle against rotation, means formanually releasing said lock pin, means for automatically bringing saidlock pin into locking engage- IHOVE- ment after its manual release, andmeans for automatically. disengaging said lock pin when the powerlcontrolling lever is brought to its driving position, substantially asdescribed.

3. A spindle, a lock pin therefor', a driving clutch and operatinglever, and a pin manipulating member adapted to be moved into the pathof the lever for releasing the pin to automatically lock the spindle,whereby the lever in throwing in the clutch automatically withdraws thepin and blocks its return, substantially as described.

et. In a machine of the class described, a frame, a main drive journaledwithin said frame, means for controlling said drive, a driven member indriven connection with said. drive, locking devices for locking said'driven member against rotation when said main drive is at rest, meansfor manually controlling the locking movement of said locking devices,and meansl for automatically throwing out said locking devices fromlocking engagement simultaneous with the start- Y ing of the main drive,substantially as described.

' 5. In a machine of the class described, a frame, a spindle j ournaledwithin said frame, transmission mechanism iiXed to said spindie, meansfor driving said transmission mechanism, means for controlling saidtransmission drive, a lock pin slidably mounted within the frame adaptedto engage the transmission mechanism upon the spindle in one positionwhile the drlve is at rest and moved to a second position for lockrelease when the drive is thrown into commission, and means formaintainin said lock pin in such released position Whi e the drive is incommission, substantially as described.

6. In a machine of the class described, a main frame, a spindle journaled in said frame, a main drive, a lever for controlling saiddrive, transmission mechanism between said drive and spindle forimparting rotation to said spindle, lock engaging rneansiixed to saidspindle, a locking pin for engaging said spindle lock engaging means,means for manually bringing sald locking pin to a locking position,means for automatically moving said locking pin to a disengagingposition simultaneous with the action of the power controlling leverwhen the latter is brought to a driving position, and means formaintaining the lookin' pin in such released position while the rive isin commission, substantially as described.

7. In a machine of the class described, a main frame, a spindlejournaledin said frame, a main drive, transmission mechanism between said spindleand main drive for imparting rotation to said spindle, a lever forcontrolling said drive, a lock pin for locking the spindle againstrotation, means for manually releasing said look pin, meansforautocontinuance of the spindle drive, substanmatieally bringing saidlook pin into a looktially as described. i0 ing position after itsmanual release, means In testimony Wliereoic I have hereunto set forautomatically moving said look pin to a my hand.

locked disengaged position When the power LOUIS THIEL. controlling leveris brought t0 its driving po- Witnesses:

sition, and means for maintaining said lock OLIVER B. KAISER,

pin in suoli disengaged position during the LEO ODONNELL.

